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New algorithm in transit-time ultrasonic flow meter has been developed for high-speed and precise requirements in semiconductor industries. Differential correlation method is used for transit-time difference calculation, and linear interpolation is applied to enhance the accuracy and precision. Single transit-times are also detected for sound speed correction. This algorithm which was proved with...
Single-event impulsive signals abound in acoustic systems. They are characterized by a confinement of their energy in a short time interval, and they usually arise, intentional or unintentionally, from explosive acoustic sources. They can seldom be observed directly, as propagation and echoes superposition distort their original impulsive shape. This work addresses the recovery of the source signal...
On-line measurement of physical parameters of solution means a great deal in the osmotic dehydration process of food. Ternary solution with NaCl and sucrose is widely employed in this process. This study aims at reconstructing concentrations of two components and estimating density, viscosity of this ternary solution with multifunctional sensing technique in which the multifunctional sensor was previously...
This paper presents a new algorithm to obtain the position of a mobile with an ultrasonic local positioning system (US-LPS). The system consists of five beacons placed in the ceiling covering a wide working area. The simultaneous emissions of all the beacons are synchronized, and encoded by using a DS-CDMA technique with five different 255-bit Kasami sequences. A receiver is placed on the mobile to...
This paper presents a development of a sensory system for analysis of badminton smashes. During a badminton game, the ability to execute a powerful smash is fundamental for a player to be competitive. In most games, the winning factor for the game is often attributed to a high shuttle speed during the execution of a smash. It was envisioned that the shuttle speed can be correlated from the speed of...
This paper discusses the design of a broadband wireless network infrastructure which itself is a rain measurement platform for applications such as disaster alarm and sudden hazard decision management systems. A sensor testbed is setup which consists of a hybrid broadband wireless network in conjunction with real-time acoustic rain rate point sensors and complementary rain gauges. The testbed simulates...
One of the main drawbacks of ultrasonic transducers is the difficulty to determine the bearing angle of echoes coming from an obstacle placed in front. Echoes often provide only the distance to the reflector inside the emission cone of the transducer, so some applications associate several transducers with the same scanning area to obtain more information about the common reflectors. This work proposes...
Two major difficulties are affronted when one looks for designing a suitable equalizing system for room acoustics. The first difficulty comes from the high variability of room transfer functions (RTFs) depending on the relative source/listener position. The second problem resides in the RTFs themselves, which are characterized by a high mode density specially at high frequencies. This paper presents...
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